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Electrical resistivity modulation of thermoelectric iron based nanocomposites
Rhein Westfal TH Aachen, Germany.
Rhein Westfal TH Aachen, Germany.
Hungarian Acad Sci, Hungary.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Tunnfilmsfysik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0002-4898-5115
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2018 (Engelska)Ingår i: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 157, s. 384-390Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Iron oxides are promising thermoelectrics, but their high electrical resistivity impedes broader applications. In this work, we have studied Fe oxides with metallic contributions. Pt and Ir additions are also considered to enhance the valence electron concentration and further modify the transport properties. Based on density functional theory explorations, Fe based clusters (Fe-3, Fe-4, and Fe3Pt) are suggested to act as nucleation sites for metallic crystallites, while O leads to formation of an amorphous matrix. This has been validated by transmission electron microscopy and x-ray photoelectron spectroscopy of sputter-grown Fe-Pt-Ir-O thin films. Densely packed bcc Fe grains, approx. 2-3 nm in diameter, are embedded in an amorphous Fe-O matrix in the as-grown state. The Seebeck coefficient reaches even -411 mu V K-1 and the electrical resistivity is up to 5 orders of magnitude lower than that of previously reported literature data on Fe oxides. We suggest that this peculiarity of our films is due to finite states localized at the Fermi level in these nanocomposites.

Ort, förlag, år, upplaga, sidor
PERGAMON-ELSEVIER SCIENCE LTD , 2018. Vol. 157, s. 384-390
Nyckelord [en]
Thermoelectric; Nanocomposites; Sputtering; Density functional theory
Nationell ämneskategori
Oorganisk kemi
Identifikatorer
URN: urn:nbn:se:liu:diva-152809DOI: 10.1016/j.vacuum.2018.09.011ISI: 000449569600053OAI: oai:DiVA.org:liu-152809DiVA, id: diva2:1265289
Anmärkning

Funding Agencies|Deutsche Forschungsgemeinschaft (DFG) [MU 2866/2]; AForsk Foundation [16-359]; Carl Tryggers Foundation [CTS 17:166]; JARA-HPC from RWTH Aachen University [JARA0131]

Tillgänglig från: 2018-11-22 Skapad: 2018-11-22 Senast uppdaterad: 2018-11-22

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